1. West China School of Public Health and West China Fourth Hospital, Sichuan University , Chengdu, China
2. Chengdu Center for Disease Control and Prevention , Chengdu, China
3. School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University , Guiyang, China
4. Division of Pulmonary Diseases, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University , Chengdu, China
5. School of Medicine, Tibet University , Lhasa, China
6. Tibet Center for Disease Control and Prevention , Lhasa, China
7. Chongqing Municipal Center for Disease Control and Prevention , Chongqing, China
8. Baoshan College of Traditional Chinese Medicine , Baoshan, China
9. Department of Nutrition and Food Hygiene, School of Public Health, Kunming Medical University , Kunming, China